/***/
 // Definition for singly-linked list.
  public class ListNode {
      int val;
      ListNode next;
      ListNode() {}
      ListNode(int val) { this.val = val; }
     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
  }

class Solution {
    public ListNode removeElements(ListNode head, int val) {
        if(head == null){
            return head;
        }
        ListNode cur = head.next;
        ListNode prev = head;
        while(cur != null){
            if(cur.val == val){
                prev.next = cur.next;
                cur = cur.next;
            }else{
                prev = cur;
                cur = cur.next;
            }
        }
        if(head.val == val){
            head = head.next;
        }
        return head;
    }
}